Service users’ involvement in the design and delivery of services has contributed significantly to the evolution of effective drug and alcohol treatment systems. This guide builds on guidance published by the National Treatment Agency (NTA) in 2006,1 looking at the evidence base, the different levels of involvement, and the impact of involvement on service users and treatment effectiveness.

There is enthusiasm for service user involvement (SUI) across the country, with a mixture of different approaches and design. This document is intended to be a useful guide to exploring and developing further SUI in your area.